Toothed power transmission belt with cloth component thereon

Abstract

A power transmission belt having a body with a length, an inside, and an outside. The body has a plurality of teeth formed on the inside of the body and spaced along the length of the body. The body has a first surface at the inside of the body defined at least in part by the teeth. A cloth component has a first side attached to the first surface and a second side exposed to engage a cooperating pulley. The cloth component has first fibers at the first side of the cloth component with a first performance characteristic and second fibers at the second side of the cloth component with a second performance characteristic. The first side of the cloth component has different properties than the second side of the cloth component by reason of the presence of the first and second fibers.

The invention claimed is: 
     
       1. A power transmission belt comprising:
 a body with a length, an inside, an outside, and laterally spaced and oppositely facing side surfaces, 
 the body having a plurality of teeth formed on one of the inside and outside of the body and spaced along the length of the body, 
 the body having a first surface at the one of the inside and outside of the body defined at least in part by the teeth; and 
 a cloth component having oppositely facing first and second sides with the first side attached to the first surface and the second side exposed to engage a pulley cooperating with the power transmission belt, 
 the cloth component comprising first fibers at the first side of the cloth component with a first performance characteristic and second fibers at the second side of the cloth component with a second performance characteristic that is different than the first performance characteristic, 
 wherein the cloth component comprises a double cloth construction defined by a first plurality of warp yarns interwoven with a first plurality of weft yarns, 
 yarns in each of the first plurality of warp yarns and first plurality of weft yarns each extending continuously between the first and second sides to be exposed to both of the first and second sides and form a single interwoven layer between the first and second sides over the entire length of the cloth component, 
 wherein: a) the first plurality of warp yarns comprises a second plurality of warp yarns with fibers exposed at one of the first and second sides and a third plurality of warp yarns with fibers exposed at the other of the first and second sides; and/or b) the first plurality of weft yarns comprises a second plurality of weft yarns with fibers exposed on the first side and a third plurality of weft yarns with fibers exposed at the second side, 
 the first side of the cloth component having different properties than the second side of the cloth component by reason of a presence of the first and second fibers. 
 
     
     
       2. The power transmission belt according to  claim 1  wherein the body comprises rubber that defines at least a part of the first surface and at least one load carrying member is embedded in the rubber and extends lengthwise of the body adjacent the other of the inside and outside of the body. 
     
     
       3. The power transmission belt according to  claim 1  wherein the body comprises rubber that defines at least a part of the first surface, the first fibers comprise a composition that adheres to the rubber at the first surface more strongly than a composition of the second fibers and the composition of the second fibers has a coefficient of friction that is lower than a coefficient of friction for the composition of the first fibers. 
     
     
       4. The power transmission belt according to  claim 2  wherein the first fibers have a composition that adheres more strongly to the rubber than the composition of the second fibers and the second fibers have a composition with a lower coefficient of friction than a coefficient of friction of the first fibers. 
     
     
       5. The power transmission belt according to  claim 3  wherein the second fibers have better abrasion resistance characteristics than the first fibers. 
     
     
       6. The power transmission belt according to  claim 3  wherein the second fibers comprise fluorine fibers. 
     
     
       7. The power transmission belt according to  claim 3  wherein the cloth component comprises warp yarns comprising nylon fibers and weft yarns comprising fluorine fibers, nylon fibers, and polyurethane elastic yarns. 
     
     
       8. The power transmission belt according to  claim 6  wherein the cloth component comprises warp yarns comprising fluorine fibers, nylon fibers, and polyurethane elastic yarns and weft yarns comprising nylon fibers. 
     
     
       9. The power transmission belt according to  claim 8  wherein the weft yarns comprise a plurality of first weft yarns at the first side of the cloth component and a plurality of second weft yarns at the second side of the cloth component and at least the plurality of second weft yarns comprises fluorine fibers. 
     
     
       10. The power transmission belt according to  claim 8  wherein the warp yarns comprise a plurality of first warp yarns at the first side of the cloth component and a plurality of second warp yarns at the second side of the cloth component and at least the second warp yarns comprise fluorine fibers. 
     
     
       11. The power transmission belt according to  claim 9  wherein from 20-100% of the warp yarns are woven by being intertwined with the second weft yarns. 
     
     
       12. The power transmission belt according to  claim 10  wherein from 20-100% of the weft yarns are woven to by being intertwined with the second warp yarns. 
     
     
       13. The power transmission belt according to  claim 11  wherein the second weft yarns comprise urethane elastic yarns that have core parts with exposed circumferences and fluorine fibers are applied on the exposed circumferences of the core parts. 
     
     
       14. The power transmission belt according to  claim 12  wherein the second warp yarns comprise urethane elastic yarns that have core parts with exposed circumferences and fluorine fibers are applied on the exposed circumferences of the core parts. 
     
     
       15. The power transmission belt according to  claim 11  wherein the first weft yarns comprise urethane elastic yarns that have core parts with exposed circumferences and nylon fibers are applied on the exposed circumferences of the core parts. 
     
     
       16. The power transmission belt according to  claim 12  wherein the first warp yarns comprise urethane elastic yarns that have core parts with exposed circumferences and nylon fibers are applied on the circumferences of the core parts. 
     
     
       17. The power transmission belt according to  claim 6  wherein the second side of the cloth component has an area and the fluorine fibers in the cloth component are exposed on the second side over from 30-100% of the area of the second side. 
     
     
       18. The power transmission belt according to  claim 3  wherein the second fibers comprise fluorine fibers, and the first side of the cloth component comprises five sateen weaves, wherein the cloth component comprises warp yarns comprising nylon fibers and weft yarns comprising fluorine fibers, nylon fibers, and polyurethane elastic yarns. 
     
     
       19. The power transmission belt according to  claim 7  wherein the fluorine fibers comprise at least one of a polytetrafluoroethylene, a polytrifluoroethylene, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkoxyethylene copolymer, and a tetrafluoroethylene-ethylene copolymer. 
     
     
       20. The power transmission belt according to  claim 8  wherein the fluorine fibers comprise at least one of a polytetrafluoroethylene, a polytrifluoroethylene, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkoxyethylene copolymer, and a tetrafluoroethylene-ethylene copolymer. 
     
     
       21. The power transmission belt according to  claim 18  wherein the fluorine fibers comprise at least one of a polytetrafluoroethylene, a polytrifluoroethylene, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkoxyethylene copolymer, and a tetrafluoroethylene-ethylene copolymer. 
     
     
       22. The power transmission belt according to  claim 7  wherein the fluorine fibers comprise polytetrafluoroethylene fibers and a polytetrafluoroethylene content in the polytetrafluoroethylene fibers is from 90-100 parts by mass per 100 parts by mass of the polytetrafluoroethylene fiber. 
     
     
       23. The power transmission belt according to  claim 8  wherein the fluorine fibers comprise polytetrafluoroethylene fibers and a polytetrafluoroethylene content in the polytetrafluoroethylene fibers is from 90-100 parts by mass per 100 parts by mass of the polytetrafluoroethylene fiber. 
     
     
       24. The power transmission belt according to  claim 18  wherein the fluorine fibers comprise polytetrafluoroethylene fibers and a polytetrafluoroethylene content in the polytetrafluoroethylene fibers is from 90-100 parts by mass per 100 parts by mass of the polytetrafluoroethylene fiber. 
     
     
       25. The power transmission belt according to  claim 18  wherein the second side of the cloth layer has an area and the fluorine fibers on the cloth layer are exposed on the second side over from 50-100% of the area of the second side of the cloth layer. 
     
     
       26. The power transmission belt according to  claim 19  wherein the second side of the cloth layer has an area and the fluorine fibers on the cloth layer are exposed on the second side over from 50-100% of the area of the second side of the cloth layer. 
     
     
       27. The power transmission belt according to  claim 22  wherein the second side of the cloth layer has an area and the fluorine fibers on the cloth layer are exposed on the second side over from 50-100% of the area of the second side of the cloth layer. 
     
     
       28. The power transmission belt according to  claim 1  wherein a resorcin-formalin-latex treatment is applied to the cloth component. 
     
     
       29. The power transmission belt according to  claim 28  wherein the resorcin-formalin-latex comprises fluorine resin in an amount of 1-80 parts by mass per 100 parts by mass of the latex. 
     
     
       30. The power transmission belt according to  claim 1  wherein the cloth component is treated with a rubber paste containing graphite in an amount of from 10-200 parts by mass per 100 parts by mass of the rubber. 
     
     
       31. The power transmission belt according to  claim 3  wherein the rubber defines at least part of the teeth and is a composition obtained by blending an unsaturated carboxylic acid metal salt and silica with a hydrogenated nitrile rubber, blending short fibers to produce a mixture, and crosslinking the mixture with an organic peroxide. 
     
     
       32. The power transmission belt according to  claim 3  wherein the rubber defines at least a part of the teeth and is a composition obtained by adding an unsaturated carboxylic acid metal salt to a hydrogenated nitrile rubber in an amount of from 15-40 parts by mass to a total polymer mass, blending silica in an amount of from 10-60 parts by mass to the total polymer mass, and blending short fibers in an amount of from 1-20 parts by mass to the total polymer mass. 
     
     
       33. The power transmission belt according to  claim 31  wherein the blended amount of silica is from 30-60 parts by mass. 
     
     
       34. The power transmission belt according to  claim 32  wherein the blended amount of silica is from 30-60 parts by mass. 
     
     
       35. The power transmission belt according to  claim 31  wherein at least one of triallylisocyanurate, triallylcyanurate, trimethylolpropane trimethacrylate and ethylene glycol dimethacrylate is added to the rubber as a co-crosslinking agent in an amount of from 5 to 20 parts by mass, and an organic peroxide is added to the rubber in an amount of from 0.2 to 10 parts by mass. 
     
     
       36. The power transmission belt according to  claim 32  wherein at least one triallylisocyanurate, triallylcyanurate, trimethylolpropane trimethacrylate and ethylene glycol dimethacrylate is added to the rubber as a co-crosslinking agent in an amount of from 5 to 20 parts by mass, and an organic peroxide is added to the rubber in an amount of from 0.2 to 10 parts by mass. 
     
     
       37. The power transmission belt according to  claim 1  wherein the other of the inside and outside of the body has a hardness of from 80-98 degree as measured with JIS A type hardness meter. 
     
     
       38. The power transmission belt according to  claim 1  wherein the first side of the cloth component has different properties than the second side of the cloth component by reason of different compositions of fibers at the first and second sides.